This thesis shows basics of ISPS Code. The key persons and their duties are mentioned in view of security protection. There are ship security officer, port security officer and company security officer. Every each of them has their own duties which must be execute so the system can work properly. Also, there are mentioned rights of the Master about security protection and ship security alert system. Security levels are described and procedures if the level of security is change. Also, responsibilities of contracting governments and companies are defined about security protection.There is explanation how we can make ship security assesment and ship security plan and meaning of declaration of security and ship security records. Ship security records are saved on board for some period of time. Importance of training and different exercises is mentioned and period in which they must be maintained is given if any danger threat to the ship, so the responsible persons may take quality reaction. In one part of the work, there is mentioned how we check and publish international conventions and how we can do security protection of stationary offshore objects. Attention is dedicated on security protection in Croatia, and rules which ensure that everything will be according to international standards. On the end, there are described basics of inspection and procedures when maritime delict happen. There are few words about obligations which must be made from recognized organizations about security protection of ship and port.